Radio Shack Headphones 33 1185 User Guide

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Cat. No. 33-1185  
OWNER’S MANUAL  
Please read before using this equipment.  
Rechargeable 900 MHz  
Wireless Stereo  
Headphones  
 
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CONTENTS  
Preparation .............................................................................................................. 4  
Connecting to an Audio Source .......................................................................... 4  
Using AC Power ................................................................................................. 4  
Installing Batteries .............................................................................................. 5  
Charging Rechargeable Batteries ................................................................ 6  
Operation ................................................................................................................. 7  
Listening Safely .................................................................................................. 7  
Using Your Headphones .................................................................................... 7  
Adjusting the Frequency ..................................................................................... 8  
Troubleshooting ...................................................................................................... 9  
Care and Maintenance .......................................................................................... 10  
Specifications ....................................................................................................... 11  
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PREPARATION  
1
4
Note: To connect a Y-adapter to a / -  
CONNECTING TO AN  
AUDIO SOURCE  
inch headphone jack, slip the supplied  
1
1
4
8
/ -inch adapter plug over the / -inch  
plug and complete the connections.  
Caution: Do not connect the transmitter  
to the audio source's speaker output.  
Doing so could damage the transmitter  
and audio source.  
To connect the transmitter to your audio  
source's audio output jacks, connect  
one end of the supplied stereo audio ca-  
ble to the transmitter's R/AUDIO IN and  
R/AUDIO IN jacks (red plug to R/AUDIO  
IN and white plug to L/AUDIO IN). Then  
plug the other ends into the audio  
source's audio output jacks (red plug to  
the right channel and white plug to the  
left channel).  
Connect the transmitter to your audio  
source's stereo headphone jack or to  
separate left and right audio output jacks  
(if available). If you connect the transmit-  
ter to audio output jacks, you can use  
the headphones’ volume control to ad-  
just the volume without turning up the  
volume on your audio source.  
To connect the transmitter to your audio  
source's stereo headphone jack, plug  
1
8
the single ( / -inch) end of the supplied Y  
adapter cable into the headphone jack  
and connect the other ends into the sup-  
plied stereo audio cable (red plug to red  
jack and white plug to white jack). Then  
connect the red plug to transmitter's R/  
AUDIO IN jack and connect the white  
plug to the L/AUDIO IN jack.  
USING AC POWER  
Use the supplied 12-volt, 100-mA AC  
adapter to connect the transmitter to AC  
power.  
4
 
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Cautions:  
INSTALLING BATTERIES  
You must use a Class 2  
power source that supplies  
To power the headphones’ receiver, use  
the three supplied AAA nickel-cadmium  
rechargeable batteries. Or, you can use  
three AAA alkaline batteries (not sup-  
plied, available at your local RadioShack  
store).  
!
12 volts DC and delivers at  
least 100 mA. Its center tip must be  
set to positive and its plug must fit  
the transmitter's DC 12V jack. The  
supplied adapter meets these speci-  
fications. Using an adapter that  
does not meet these specifications  
could damage the transmitter or the  
adapter.  
Cautions:  
• Use only fresh batteries of the  
required size and recommended  
type.  
• Always connect the AC adapter to  
the transmitter before you connect it  
to AC power. When you finish, dis-  
connect the adapter from AC power  
before you disconnect it from the  
transmitter.  
• Do not mix old and new batteries,  
different types of rechargeable bat-  
teries, or rechargeable batteries of  
different capacities.  
Follow these steps to install batteries.  
Plug the supplied AC adapter’s barrel  
plug into the transmitter’s DC 12V jack,  
then plug the adapter into a standard AC  
outlet.  
1. Remove the battery compartment  
cover on the left earpiece by push-  
ing up the tab and pulling the cover  
up in the direction of the arrow.  
2. Place the batteries over the ribbon  
in the compartment, as indicated by  
the polarity symbols (+ and –) in the  
illustration.  
3. Replace the cover.  
5
 
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When the headphones stop operating  
properly, replace or recharge the batter-  
ies.  
Charging Rechargeable  
Batteries  
Before using your headphones for the  
first time, you must charge the head-  
phones’ batteries for at least 24 hours. If  
the headphones' range decreases or  
you hear no sound from the audio  
source, recharge the batteries. It takes  
12 to 14 hours to completely recharge  
the batteries.  
Warnings:  
• Do not dispose of the batteries in a  
fire because they can explode.  
• Do not open or mutilate a battery.  
Swallowing a battery can be fatal.  
• Be careful not to short the batteries  
with conducting materials, such as  
rings, bracelets, and keys. The bat-  
teries or the conductor might over-  
heat and burn.  
Follow these steps to charge the batter-  
ies.  
1. If necessary, press the headphones'  
POWER ON/OFF button to turn off  
the headphones.  
• Do not attempt to charge alkaline  
batteries.  
Note: You cannot charge the batter-  
ies with the headphones turned on.  
Caution: When you replace the batter-  
ies, use replacement batteries of the re-  
quired type (AAA), available through  
your local RadioShack store.  
2. Plug the supplied charging cable  
into the headphones' CHARGE jack  
on the left earpiece.  
Important: This product  
can use nickel-cadmium  
rechargeable batteries.  
At the end of a nickel-  
cadmium battery's useful  
life, it must be recycled or  
disposed of properly. Contact your local,  
county, or state hazardous waste man-  
agement authorities for information on  
recycling or disposal programs in your  
area or call 1-800-843-7422. Some op-  
tions that might be available are: munici-  
pal curbside collection, drop-off boxes at  
retailers such as your local RadioShack  
store, recycling collection centers, and  
mail-back programs.  
3. Plug the other end of the charging  
cable into the transmitter base's  
CHARGE jack. The indicator beside  
the jack lights.  
0
0
8
3
4
4. When charging is complete, unplug  
the charging cable. The indicator  
turns off.  
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OPERATION  
flash, rotate LEVEL clockwise until  
the indicator flashes.  
LISTENING SAFELY  
To protect your hearing, follow these  
guidelines when you use headphones.  
• Set the volume to the lowest setting  
before you begin listening. After you  
begin listening, adjust the volume to  
a comfortable level.  
• Do not listen at extremely high vol-  
ume levels. Extended high-volume  
listening can lead to permanent  
hearing loss.  
If you connected the transmitter to  
an audio source's line output jack  
(or a jack that is not controlled by  
the audio source's volume control),  
rotate VOL on the headphones fully  
counterclockwise, then rotate LEVEL  
until the indicator flashes rapidly or  
remains lit.  
• Once you set the volume, do not  
increase it. Over time, your ears  
adapt to the volume level, so a vol-  
ume level that does not cause dis-  
comfort might still damage your  
hearing.  
Note: Some audio sources might  
not make the indicator flash. For  
these sources, rotate LEVEL all the  
way to the left.  
USING YOUR  
HEADPHONES  
3. Press the head-  
phones'  
POWER  
ON/OFF button to  
1. Turn on the audio source.  
turn on the head-  
phones.  
The  
Note: If connecting headphones  
does not automatically disable the  
audio source’s speakers, turn off the  
speakers.  
POWER indicator  
on the left earpiece  
lights.  
2. If you connected the transmitter to  
an audio source's headphone jack  
(or a jack that is controlled by the  
audio source's volume control), set  
LEVEL on the back of the transmitter  
about midway, then rotate the audio  
source's volume control until the  
indicator at the front of the transmit-  
ter flashes. If the indicator does not  
4. Rotate TUNE until  
the STEREO indi-  
cator on the right  
earpiece lights.  
5. Put on the head-  
phones and adjust  
VOL on the right  
earpiece to the  
desired  
level.  
listening  
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6. To turn off the headphones, take off  
the headphones, then press the  
POWER ON/OFF button.  
ADJUSTING THE  
FREQUENCY  
If you receive interference from other  
devices, you might be able to reduce the  
interference by adjusting your head-  
phones’ operating frequency.  
To preserve battery life, be sure to turn  
off the headphones when you are not  
using them.  
Notes:  
Simply rotate FREQ ADJUST on the  
transmitter then rotate TUNE on the right  
earpiece until the STEREO indicator  
lights steadily.  
• The STEREO indicator on the right  
earpiece lights when the head-  
phones are receiving a clear signal.  
As you move out of the transmitter's  
range, the STEREO indicator turns  
off. You still can hear the audio  
source in mono until you move com-  
pletely out of range.  
• If reception is poor even when the  
batteries are fully charged and you  
are near the transmitter, try moving  
the transmitter to a higher location  
or moving it away from the audio  
source.  
8
 
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TROUBLESHOOTING  
We do not expect you to have any problems with your headphones, but if you do, the  
following suggestions might help.  
Problem  
Solution  
No sound  
Be sure the headphones are turned on.  
Charge the headphones' batteries.  
Be sure the AC adapter is plugged in and has power.  
Be sure all cables are connected securely.  
Be sure the audio source is turned on and tuned to an  
active channel.  
If you have connected the transmitter to jacks that are  
controlled by the audio source's volume control, be sure  
the source's volume control is turned up.  
If the stereo indicator on the right earpiece is not on,  
adjust  
on the right earpiece until it turns on.  
TUNE  
Adjust the headphones' volume control.  
Change the position of the transmitter.  
Distorted audio  
If the STEREO indicator on the right earpiece does not  
light steadily, adjust  
on.  
on the earpiece until it turns  
TUNE  
Rotate  
TUNE  
on the transmitter, then adjust  
FREQ ADJUST  
on the right earpiece until the STEREO indicator  
on the earpiece lights steadily.  
If you connected the transmitter to an audio source’s  
headphone jacks, reduce the audio source’s volume.  
Charge the headphone's batteries.  
Change the position of the transmitter.  
Adjust the  
control on the transmitter so the level  
LEVEL  
indicator flashes only occasionally.  
If you still have problems, take the headphones to your local RadioShack store for as-  
sistance.  
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CARE AND MAINTENANCE  
Your  
an ex-  
RadioShack Rechargeable 900 MHz Wireless Stereo Headphones are  
ample of superior design and craftsmanship. The following suggestions will help you  
care for your headphones so you can enjoy it for years.  
Keep the headphones dry. If they get wet, wipe them dry immediately.  
Liquids might contain minerals that can corrode the electronic circuits.  
Use and store the headphones only in normal temperature environ-  
ments. Temperature extremes can shorten the life of electronic devices,  
damage batteries, and distort or melt plastic parts.  
Keep the headphones away from dust and dirt, which can cause prema-  
ture wear of parts.  
Handle the headphones gently and carefully. Dropping them can dam-  
age circuit boards and cases and can cause the headphones to work  
improperly.  
Use only fresh batteries of the required size and recommended type.  
Batteries can leak chemicals that damage your headphones’ electronic  
parts.  
Wipe the headphones with a damp cloth occasionally to keep them look-  
ing new. Do not use harsh chemicals, cleaning solvents, or strong deter-  
gents to clean the headphones.  
Modifying or tampering with the headphones’ internal components can cause a mal-  
function and might invalidate their warranty and void your FCC authorization to op-  
erate them. If your headphones are not performing as they should, take they to your  
local RadioShack store for assistance.  
10  
 
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SPECIFICATIONS  
Transmitter  
Carrier Frequency ....................................................................... 912.25–914.75 MHz  
Power Source ......................................................................... 12V DC, 100 Milliamps  
Modulation Method ............................................................................. FM Modulation  
Headphones  
Frequency Response ........................................................................... 50 Hz –12 kHz  
S/N Ratio ......................................................................................................... >55 dB  
Stereo Separation ............................................................................ 20 dB or Greater  
Audio Distortion ................................................................................................... <2%  
Operating Range ..................................................................... 150 Feet (Open Field)  
Specifications are typical; individual units might vary. Specifications are subject to  
change and improvement without notice.  
11  
 
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Limited Ninety-Day Warranty  
This product is warranted by RadioShack against manufacturing defects in material and workman-  
ship under normal use for ninety (90) days from the date of purchase from RadioShack company-  
owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED  
HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES,  
INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,  
ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES  
CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABIL-  
ITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RE-  
SPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE  
OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WAR-  
RANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVE-  
NIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,  
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN AD-  
VISED OF THE POSSIBILITY OF SUCH DAMAGES.  
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in-  
cidental or consequential damages, so the above limitations or exclusions may not apply to you.  
In the event of a product defect during the warranty period, take the product and the RadioShack  
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, un-  
less otherwise provided by law: (a) correct the defect by product repair without charge for parts and  
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase  
price. All replaced parts and products, and products on which a refund is made, become the prop-  
erty of RadioShack. New or reconditioned parts and products may be used in the performance of  
warranty service. Repaired or replaced parts and products are warranted for the remainder of the  
original warranty period. You will be charged for repair or replacement of the product made after the  
expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse,  
accident, misuse, improper or abnormal usage, failure to follow instructions, improper installation or  
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs  
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as  
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs  
of product removal, installation, set-up service adjustment or reinstallation.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
RadioShack Customer Relations, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102  
04/99  
We Service What We Sell  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
11A99  
Printed in Hong Kong  
 

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